Top Principal Software Engineer Jobs in Denver & Boulder, CO

Lead design, development, testing, and deployment of software systems supporting manufacturing operations. Define system and database architecture, capture user requirements, implement automated/standardized processes, mentor engineers, conduct code reviews, collaborate cross-functionally, and drive continuous improvement to ensure product quality, reliability, and manufacturability.

Lead remote engineering teams to design, architect, and deliver scalable, high-availability education technology platforms focused on content systems, workflows, and GenAI. Drive product and technical strategy, collaborate with product/design, implement cloud-native architectures, adopt agile practices, measure performance through data and testing, and continuously improve user engagement and platform reliability.

Lead architecture and development of high-performance, scalable backend systems for Yahoo Mail using Java and C++. Set technical strategy, establish architectural standards, validate AI-generated code, mentor senior engineers, collaborate cross-functionally, and ensure reliability through automated logging, telemetry, and debugging workflows.

Lead the technical vision and architecture of simulation software for spacecraft, focusing on multi-physics modeling and real-time execution, while driving engineering standards and mentoring teams.

Lead design and implementation of advanced systems features for Postgres, focusing on performance optimization and scalability. Mentor engineers and drive architectural direction for large-scale database systems.

Lead architecture and technical direction for Athena, a production-grade distributed system that validates, deduplicates, and routes enterprise vulnerability data. Drive transition from prototypes to maintainable systems with observability, SLOs, incident handling, and operational rigor. Partner across teams on domain ownership, hire and raise engineering standards, and design pipelines that extract clean signals from unstructured vulnerability reports.

Lead backend development for Dragos' OT security platform: design and implement high-performance systems in Rust, optimize architectures, participate across the development lifecycle, integrate databases and third-party data providers, incorporate AI tools, mentor senior engineers, and drive cross-team architectural decisions.

As a Principal Flight Software Engineer, you will lead the architecture and development of flight software for space missions, ensuring safety and reliability while collaborating on technical decisions and standards.

Lead architecture and technical strategy across an infrastructure platform ecosystem. Drive hands-on architectural improvements to graph engine and backend services, reduce technical debt, establish standards, champion AI-first engineering practices, run architecture/code reviews and mentorship, and collaborate with product and leadership to ensure scalable, extensible systems.

The Principal Software Engineer will drive the technical roadmap for Panthey's hosting platform, architect core services, and provide technical leadership and mentoring to engineers. They will work on distributed systems, container orchestration, and AI-native engineering practices, ensuring platform reliability and performance.

The Principal Software Engineer will lead the technical strategy for high-concurrency services, oversee backend design, integrate AI, and ensure operational excellence at Cars Commerce.

Lead design, development, and support of enterprise infrastructure and services. Drive architecture discussions, prototypes, capacity planning, and system launches. Troubleshoot performance, collaborate across teams and open-source communities, document solutions, and support on-call rotations to ensure reliable, scalable cloud and Linux-based systems.

Lead full-cycle software engineering for missile defense prototypes, integrating sensors/weapons and algorithms. Design using Java/OOP, manage deployments across Windows and Unix/Linux, automate builds/tests, and maintain test coverage. Work onsite at Schriever SFB with occasional travel and support rapid, event-driven schedules.

Architect and build AI-native production systems across a multi-language stack, design offline and online evaluation frameworks for LLMs, monitor live model behavior and drift, lead architecture reviews, mentor senior engineers, and prototype and ship AI capabilities while ensuring reliability and correctness in a regulated domain.

Senior engineering role to design, implement, and scale core features of Couchbase's cloud and edge database platform (Capella); collaborate cross-functionally, improve performance and reliability, and mentor other engineers.

Serve as software architect and development lead for surgical patient monitors: design, develop, test, and harden embedded and desktop applications; mentor developers; collaborate with global R&D and cross-functional teams; manage triage, security (threat modeling, SAST, SBOM), OS build hardening, performance profiling, documentation, and stakeholder demos.

Lead backend software development for HPE Morpheus, analyzing system logic, designing software systems, collaborating with teams, and updating documentation.

Lead technical aspects of an engineering team, design and revamp systems, improve efficiency, mentor engineers, and contribute to product strategy.

Lead the technical roadmap and design for Marqeta's core issuing and processing platform. Drive high-impact initiatives to improve performance, reliability, scalability, and cost-efficiency. Write, review, and optimize code across the stack, partner with product, mentor technical leads, and evangelize best practices for resiliency, security, and multi-region systems.

The Senior Principal Product Architect leads the architecture of Workload Automation and DevOps solutions, focusing on automation technologies, hybrid cloud environments, and mentoring teams to modernize software engineering processes.

Founding engineer responsible for architecting and building core product systems, writing scalable Python backend code, designing and maintaining AI/ML infrastructure, instituting best development practices (testing, CI/CD), collaborating on product roadmap, and mentoring future engineers.

Lead design, architecture, and hands-on implementation of scalable healthcare SaaS systems. Drive interoperability (HL7, FHIR, EDI), mentor engineers, liaise with stakeholders, manage technical risk, and ensure quality, performance, security, and innovation.

Lead architecture and technical direction for a cloud-native contact center platform. Design scalable, reliable frontend and backend systems, resolve complex production incidents, mentor senior engineers, and drive engineering standards and cross-team alignment.

Lead backend and full-stack engineering strategy, design and deliver scalable, secure distributed systems and microservices for government customers. Drive architecture, data design, observability, CI/CD, cloud-native patterns, mentoring, and large modernization initiatives while collaborating with product and stakeholders.

Lead design and implementation of test automation and performance engineering for Streaming/OTT, STB, mobile, web, and backend API services. Build automation frameworks, create load/test strategies, analyze server-side performance with monitoring tools, manage CI/CD pipelines and environments, and mentor team members on automation, performance goals, and technical reviews.